The invention relates to the technical field of bridge construction, in particular to a three-span variable-height steel-concrete mixed
continuous beam construction method which comprises the following steps: firstly, constructing a NO. 0 block of a steel-concrete mixed
continuous beam; after completion, symmetrically pouring first to eighth
hanging basket cantilevers; after completion, hoisting asteel-concrete combined section; during hoisting, arranging a rhombus
hanging basket at the position of an eighth poured beam body section, arranging a hoisting platform on the rhombus
hanging basket, wherein the hoisting platform is provided with four hydraulic lifters, and the four hydraulic lifters are used for hoisting the
steel box girder of the steel-concrete combined section to a mountingposition of the
steel box girder from a river middle girder transporting ship; after the
steel box girder is hoisted in place, creating a steel-concrete combined section
reinforced concrete structureof the girder section, so that a steel-concrete combined section is formed; removing the temporary lock of the NO. 0 block; constructing a mid-span closure section and forming the three-span variable-height steel-concrete mixed
continuous beam. The invention has the advantages that hoisting time is short, the traffic can be opened after the vehicle is in place, the temporary occupation time of roads and navigation channels is shortened, and the
adverse effect on social traffic is reduced.